Though the audacious project had come to a crashing end, news of the discovery generated unrestrained glee across the Atlantic at CIA headquarters. America's spymasters were thrilled by the world's response: admiration for the CIA's daring and technical prowess, and a general assumption that the agency had roundly snookered the Soviets.
The truth was much more complicated. Unbeknownst to the CIA, the Soviets had known about the tunnel all along. (more)
Book: Battleground Berlin: CIA vs. KGB in the Cold War